I lost quite a few jobs in a compact area recently - obviously some cheaper window cleaner moved in on my customers, it's common sense to suss that out, I don't need to ask the customers why they lied to me with a note. I'm just grateful they had the decency to send me a note to cancel window cleaning, rather than clean them again and have difficulty trying to recoup my money.
Forget the cancellations, life's too short to worry and move on to better paying jobs....I did, I've replaced them now.